My concern would be the same as when Short Course Trucks came out, being that they were similar (2wd trucks), that they would thin the field and hurt entries in the pre-exisiting Stadium Truck class fields. As I forewarned, it happened, and it wasn't long before the Stadium Truck class was dead. So in essence, Short Course Trucks replaced Stadium Trucks - and that's fine.
What I don't want to see happen is this "rebirth" in Stadium Trucks just because one manufacturer releases a new truck, as it will have the reverse effect and thin the fields in Short Course Trucks - OR - what would be even worse in my opinion, add another class at the track and extend the race day.
And it gets under my skin when they invent a new class that sends another vehicle of mine to collect dust on the shelf, especially when that class already came and went.